gutenberg-set-default-nav-type.php

<?php
add_action(
    'enqueue_block_editor_assets',
    function() {
	    wp_register_script(
            'mihdan-editor-js',
            get_theme_file_uri( 'js/editor.js' ),
            [ 'wp-blocks' ],
            filemtime( get_theme_file_path( 'js/editor.js' ) ),
            true
        );

	    wp_enqueue_script( 'mihdan-editor-js' );
    }
);
/* JS:
const enableToolbarButtonOnBlocks = [
    'core/navigation'
];


function filterCoverBlockAlignments(settings, name) {
    if ( ! enableToolbarButtonOnBlocks.includes( name ) ) {
        return settings;
    }

    console.log(settings);
        return lodash.assign({}, settings, {
            supports: lodash.merge(settings.attributes, {
                overlayMenu: {default: 'never'},
            }),
        });

}

wp.hooks.addFilter(
    'blocks.registerBlockType',
    'plugin-name/cover-block/alignment-settings',
    filterCoverBlockAlignments,
);
*/